Hypodermic injector.



PATENTED JUNE 25, 1907.

D. s. RBESB, HYPODERMIG INJECTQR. APPLICATION FILED JULY 21 1906 wezenscof, wAsNlNcwN. n, c.

is arranged to detachably fit thereon.

. DANIELv SCOTT REESE, OF MAIIANOY CITY, PENNSYLVANIA.

HYPODERIVHC INJECTOR.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed July 21, 1906. Serial No. 327,155.

F0 all whom it muy concern:

Be it known that I,'DANIEL SCOTT REEsE, a citizen of the United States,residing at Mahanoy City, in the county of Schuylkill and State ofPennsylvania, have invented a new and useful Hypodermic Injector, ofwhich the following is a specification.

This invention relates to hy odermic syringes, and one of theprincipali) objects is to provide a novel needle, and means for securingthe same to the reservoir or cylinder, so that it may be easily removedand replaced, is not liable to become clogged, eliminates the necessityof soldering and washers, is not liable to leak, can be readilysterilized, permits the easy introduction of the usual wire, and can bemanufactured at small cost.

Another and important object is to provide a simple structure that willpermit the ready detachment of the plunger from the actuating stem, sothat in case of wear or injury, a new plunger can be employed withoutdifliculty.

Several embodiments of the invention are illustrated in the accompanyingdrawings, wherein Figure 1 is a side elevation of one form ofconstruction. Fig. 2 is a vertical sectional view on an enlarged scalethrough a portion of the same. Fig. 3 is a detail view of the plunger,anda portion of the actuating stem, showing the same separated. Fig. 4is a detail view through a modified form of construction. Fig. 5 is adetail view partly in section and partly in elevation of anotheembodiment of the invention.

Similar reference numerals designate corresponding parts in all thefigures of the drawings.

Referring to the embodiment illustrated in Figs. 1, 2 and 3, a reservoiror plunger cylinder 6 is employed, from one end of which projects anintegral nipple 7. This nipple has an inner eXteriorly threaded portion8, and an outer tapered portion 9. A needle 10 has its inner portiontapered to correspond to the taper of the outer end 9 of the nipple 7,arlid T ie needle is held in place by a cap 11, having its inner portioninteriorly threaded, and arranged to screw upon the threaded portion 8of the nipple 7, the outer portion of this cap being tapered, as shownat 12, and fitting over the inner portion of the needle 10.

Operating in the cylinder or reservoir 6is a solid plunger 13, actuatedby a stem 14 that projects from the rear end of the reservoir orcylinder, and has a suitablehead 15. The plunger 13 and stem 14 aredetachably connected, and for this purpose, the former is provided onits rear end with a rearwardly projecting centrally disposed dovetail16, while the adjacent end of the stem has a correspondingly shapedrecess 17, that detachably receives the projection 16. It will thus beevident that as long as the parts are interlocked, and remain in thecylinder 6, they will be maintained in their interlocking engagement,but if removed, the plunger can be readily disengaged from the stem by arelative lateral movement between the same. Therefore in case of wear ofthe plunger, a new one may be substituted for the Worn one, and thechange can be made without difliculty.

The construction and connection of the needle to the cylinder is animportant feature and moreover, because of its tapering con-- struction,is not liable to become clogged. The necessity of soldering the needleandthe use of washers are eliminated. Moreover there is little liabilityof leakage at the joints. Furthermore the needle, because of itsenlarged rear end, can be readily sterilized, as can also the'associated parts, and the wire ordinarily placed in the bore of theneedle when not in use, can be easily introduced through the enlargedinner end thereof. The structure can also be manufactured at small cost,and the various parts may be made interchangeable.

Fig. 4 shows a slightly modified form of construction. The cylinder orreservoir is illustrated at 18, and has an integral eXteriorly threadedstem 19 projecting therefrom. The nipple in this case is designated 20,and is detachable, its inner end being interiorly threaded and screwedupon the stem 19. The outer end is tapered, as shown at 21. The needle22 is Afitted upon the tapered portion, and is held in place by a cap 23threaded upon the inner portion of the nipple.

Fig. 5 shows still another embodiment of the invention. The cylinder isdesignated 24, and has a nipple 25, provided with portions 26 and 27 ofdifferent tapers.

29 fits over the inner portion of the needle, and has a tapered portion30 that detachably engages the tapered part 26.

The needle 28 its upon the portion 27 and a cap IOO IIO

From the foregoing, it is thoughtthat the construction, operation, andmany advantages of the herein described invention Will be apparent tothose skilled in the art Without further description, I and it Will beunderstood that various changes in the size, shape, proportion and minordetails of construction, may be resortedV to Without departing from thespirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. A hypodermic injector, comprising a reservoir having a taperednipple, a needle having its inner end portion interiorly and eX-teriorly tapered, said needle having its tapered portion fitted upon andsurrounding the tapered nipple, and a cap detachably fitted on thenipple and having an interiorly tapered portion that ts against theeXteriorly tapered portion of the needle.

2. A hypodermic injector, comprising a reservoir having a nipple, theinner portion of which is threaded, the outer portion being tapered, aneedle having its inner portion interiorly and exteriorly tapered, saidneedle having its tapered portion iitted upon and surrounding thetapered nipple, and a cap detachably screwed upon the threaded portionof the nipple and having its outer end portion interiorly tapered, saidtapered portion of the cap surrounding and iitting against theeXteriorly tapered portion of the needle.

3. A hypodermic injector, comprising a cylinder reservoir having anipple, a needle detachably secured thereto, a reciprocatory plungerelement operating in the reservoir, and a stem. element, one of saidelements being provided with a dovetailed socket that opens through oneside and through one end of said element, the other element having adovetailed projection extending through the open end thereof and beingdetachable through the open side, the open end of said dovetailed socketbeing closed by the wall of the cylinder reservoir When the parts are inplace therein, to prevent their detachment.

In testimony, that I claim the foregoing as my own, I have heretoaflixed my signature in the presence of two Witnesses.

DANIEL SCOTT REESE.

Witnesses:

FRANK STRYKER, JACOB BUscH.

